Mechanism and the Origins of Stereospecificity in Copper-Catalyzed Ring Expansion of Vinyl Oxiranes: A Traceless Dual Transition-Metal-Mediated Process

Thomas J. L. Mustard, Daniel J. Mack, Jon T. Njardarson, and Paul Ha-Yeon Cheong 

 J. Am. Chem. Soc., 2013, 135 (4), pp 1471–1475 

DOI: 10.1021/ja310065z